Upgraded to R90 from R88 today and "on touched" isn't working when I use the LAN to test on a mobile device. All is fine when I view it through the browser on my PC (I'm using 'enable mouse' on the touch plugin).
Rolled back to R89 and LAN still not allowing touch. Rolled back to R88 and touch is working on LAN again.
I'll build a basic .capx tomorrow and post here if needed.